Today I spun up a quick development instance using Ubuntu 15 and found that Aptana refused to connect via SFTP. After a few rounds of Google > Fix > New Error > GOTO 10 I’ve found that there are two problems.
- Aptana does not support anything more advanced than diffie-hellman-group1-sha1 for key exchange.
- OpenSSH has removed AES*-CBC ciphers from its default ciphers in favor of newer AES*-CTR ciphers.
- Aptana has explicitly disabled CTR support in their SSH library.